New Universality of the Metal-Insulator Transition in an Integer Quantum Hall Effect System
- Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5506 (United States)
A new universality of the metal-insulator transition in an integer quantum Hall effect (IQHE) system is studied, based on a lattice model, where the IQHE states exist only within a finite range of Fermi energy in the presence of disorders. A two-parameter scaling law is found at the high-energy boundary where direct transitions from high filling-factor IQHE states to an insulator occur. We find that {rho}{sub xx}={rho}{sub xy} at the critical point whose value can continuously vary as a single function of the Landau-level filling number n{sub {nu}} . Such a new universality well explains the recent experiment by Song {ital et al.}[Phys.Rev.Lett.{bold 78}, 2200 (1997)]. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573892
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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